Corrugated base for pavements



Sept. 6, 1927. I .641.655

w. BANNEN v CORRUGATED BASE FOR PAVEMENTS Filed Feb. 23, 1926 Patented Sept. 6, 1927.

UNITED STATES PATENT OFFICE.

WILLIAM BANNEN, OF MILVIAUKEE, WISCONSIN, ASSIGNOR F ONEHALF TO FRED HICKSTEIN, OF MILVTAUKEE, \VISCONSIN.

CORRUGATED BASE FOR PAVEMENTS.

Application filed February 23, 1926.

This invention relates to a corrugated ,base for pavements for roadways and to the method of making such base.

In making bituminous pavement with a concrete base, it has been the practiceheretofore to, provide interlocking pockets 1n the base which engage tongues formed in the pavement. v These pockets collect water and are a serious handicap in laying the pave- W ment as it is necessary to wait until the pockets have been dried by evaporation or exposureto the sun. This necessarily causes great delay in the actual production of the pavements, and in addition to this, it frequently happens that these pockets contain moisture when the bituminous top layer is placed in position. This defect causes loosening of the top layer with consequent cracking and disintegration.

This invention is designed to overcome the defects discussed above, and objects of such invention are to provide a concrete base for a pavement which is so constructed that no moisture collecting pockets are formed although means are provided for interlocking with the top layer.

Further objects are to provide a novel form of base for a bituminous top layer which is so constructed that there is a slant from the center of the base to opposite sides thereof and in which continuous channels are formed from the crown of the base to the sides so that any water that falls within these channels will immediately drain outwardly, thereby avoiding all of the defects noted above.

Further objects of this invention are to provide a novel method of forming the base, such method providing for the easy and quick positioning of the parts during the formation of the base and insuring the results discussed above.

An embodiment of the invention is shown in the accompanying drawings, in which:

Figure 1 is a plan view of a portion of a roadway during construction showing the mat and other portions of the members used in producing this base in position.

Figure 2 is a sectional view on the line 22 of Figure 1.

Figure 3 is an enlarged sectional view on the line 3-3 of Figure 2.

Figure 4 is an enlarged sectional view on the line H of Figure 2.

Serial No. 90,034.

Figure 5 is an enlarged sectional view on the line 55 of Figure 2.

Figure 6 is a fragmentary view corresponding to Figure 2 showing a section through the base after the mat and other portions have been removed.

In practicing this invention, the concrete base is laid and is crowned and comprises a main portion 1 and curbing portions 2 at opposite sides thereof. separated in any suitable'manner to form longitudinally extending channels 3. While the concrete is still soft, wooden strips {t are positioned within the channel 3 and a center wooden strip5 is locatedfin the crown or center portion of the rod. These stripsare connected by means of cables 6 which'are held in place by means of staples 7 and 8 driven into the strips 4 and 5. It is preferable that the staples 7 be relatively loose so that the cable 6 may be tightened by drawing on their free ends 6'. Thereafter, the staples 7 are tightened as desired. A platform or boarding 9 is laid on the mat thus formed and a roller or other device of the type is passed back and forth over the platform to thus press the cables or members 6 in place as shown in Figure 4 within the soft concrete. This forms a series of pockets 10 (see Figures 4 and 6) which extend continuously from the crown of the pavement to the channels 3 and are unbroken from one end to the other.

It is to be distinctly understood that in place of the cables 6, rods or other members of this type may be provided, and it is also to be understood that the channels 10 might not necessarily extend straight across the roadway, but may be made slanting, zigzagging, or in any other shapes providing, however, that the essential idea of this invention is followed to provide a series of continuous channels from the crown of the road to opposite sides thereof.

After the members 6 have been forced into the concrete, the boarding 8 and the entire mat is moved to the next portion of the concrete to be treated and the concrete is allowed to harden.

It is apparent, therefore, that a series of channels for interlockin engagement with the bituminous top layer liave been provided by this method and that these channels are unobstructed from the crown to the outer These portions are end and slant downwardly to the edges of the roadway. These channels, therefore, will notcollec t Water and will not pocket any moisture, instead any moisture that finds its way into these channels will immediately drain to opposite sides of the roadway and into the longitudinal channels which is most clearly brought out in Figure 3. The transverse channels 10 interlock with the bituminous top layer of the pavement and secure all of the desirable results due to this interlocking. Hoiveyer, it not necessary to ait nntil a dry sni shiny day in order to lay t bituminous r eye, ,1 ti 1?- parent that the cgncr ete when it fully set is'i'n condition for the immediate IQQQP t-IOI'I of the bituminous to-p Iayei" irrespective of we te d n'difidee- It em petse n. the re tore ha a mater al i l rtei eg be time .e e i f li le ms type b pa emen sec red by h s n- .yeIi-tion. Feither, it is to be particularly e t d at theip t e r my h v iped tipnsly renewed in I, manner. .t is ben ote further that the appara i s'reqnired' for the process is extremely "s1 eto be noted further that a novel form of base has been provided for insuring draining pr drying and which may be very cheaply and quickly produced.

Although the invention has been described in considerable de a such des ript on is ntended as illustrative rather than limiting as the invention may be variously embodied and as the scopeof such invention is to be determined as claimed,

I claim:

The method of making a concrete base for an interlocking ayement, said methodcom prising placinga layer of conerete on the wi m row i g t n et ple 'in a center heard and marginal boards the qn rete, st h g flex ble lemh r between said boards and securing thereto, forming a p' la ttorlii 6Y6? said' fiegible membe s an p s'is' n ol ht' ri i' l i irii y a e e 'i retee i s d l tt m a s bsequ ntly rem v n sa d fl xib members platform andb ards. i In t s mony t at 1 C a m i fdregoing 1 have hereunto set {my hand at Milyyaukee; in the C y o M lwa k e and S at fe'fW consin. i i

WlLLIAM ANNEN, 

